Take-up device for sewing-machines



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TAKE-UP DEVICE FOR SEWING MACHINES. No. 399,685. Patented Mar. 19, 1889.

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LEE E. MOORE AND YVILLARD A. DAVIS, OF BOSTON, MASSACHUSETTS,

(CHARLES P. GAITHER EXEC'U'TOR OF LEE E. MOORE, DECEASED,) AS- SIGNORSTO THE DAVIS-MOORE SEXVING MACHINE COMPANY, OF

SAGO, MAINE.

TAKE- UP DEVICE FOR SEWING=MACHINES.

SPECIFICATION forming part of Letters Patent No. 399,685, dated March19, 1889.

To all whom, it may concern.-

Be it known that we, LEE E. MOORE and WILLARD A. DAVIS, both of Boston,county of Suffolk, State of Massachusetts, have invented certain new andusefulImprovements in Sewing-Machines, of which the following is aspecification, taken in connection with the drawings accompanying andforming a part hereof, in which Figures 1. and 2 are side elevationsfrom opposite sides of a wax-thread sewing-machine, showing ourimprovements. Fig. 3 is a section on dotted line 00 a of Fig. 1. Fig. 41is a front elevation. Fig. 5 is a cross-section on dotted line y y, Fig.2.

Our present invention is an improvement in the machine shown anddescribed in a se ries of patents therefor and for the different partsthereof by Job Davis, ofBoston, aforesaid, said patents having beenissued November 23, 1886, and numbered 353,252 to 353,257, inclusive.Since a detailed description of the various parts of the machine will befound in said series of patents, it will be unnecessary for us to referin the present specification to other than the improvements which formthe subject-matter thereof.

A is the frame of the machine, and B is the main shaft, to which poweris applied by means of the belt-pulley D. The other end of the mainshaft carries a case which contains a shuttle, the same in constructionas is shown and described in the said patents above referred to. 011 theshaft B is secured a cam, E, which actuates a lever, F, which is pivotedto the frame of the machine at G, the upper end of the lever F beingconnected with a sliding bar, I-Lwhich forms part of the take-upmechanism. The forward end of the bar H projects downwardly and ispivoted to a T-shaped lever, l, at J. (See Fig. 1.) The T-shaped leveris pivoted at K to the heatingboX L, and is provided at either end ofits arm with sheaves i set therein, over which the thread M passes. Toprevent the thread from getting off the sheaves during the movement ofthe take-up arms, the guards or retainingpieces N are provided, whichproject in a U shape over the peripheries of the sheaves.

After the thread leaves the sheave at the forward end of the lever I itpasses through a tube, 0, which is connected with the heatingbOX, and isthereby heated, and so acts to keep the waxed thread in workingcondition, and from this tube the thread passes through thethread-carrier a and directly to the -nee-" dle. Before reaching thesheave at the rear end of lever I the thread passes through a checkingor gripping device, which consists of a grooved pulley or sheave, P, anda vertically-sliding bar, R, Figs. 1 and 3. The sliding bar R isactuated by a leaf-sprin g, S, which bears upon its upper end, and whichis secured to the top of the frame of the machine. This bar R is held inposition on the frame of the machine by screws a, which pass throughslots in the bar, and thus permit of its vertical movement. The threadpasses around pulley P, and a part or all of the lower end of the bar Ris cut to correspond to the curve of the periphery of the pulley, withwhich it comes in contact when the said bar R is down. When the take-upis slack, or in position to allow the thread to be drawn forward to thework, the bar R is up, permitting the free movement of pulley P andpresenting no resistance to the movement of the thread. lVhen thetake-up is acting to draw the lower thread up into the work, the bar Ris down, bearing on the pulley P, preventing its movement and preventingthe paying out of the thread. This movement of bar R is accomplished bymeans of a pin, 0, fast thereto, (see Fig. 1,) which comes in contactwith the shoulder or inclined part (I of the sliding bar H. Thebearing-surfaces of the gripping device are preferably so located(see'Figjl) as to give the thread a straight course to thethread-carrier when the take-up is in its slack position. \Vhen thethread is free to move, the bar H is at the end of its forward throw,raising the bar R and throwing the take-up arm Iinto the position shownin dotted lines, Fig. 1. A movement of the bar H in the 0ppositedirection immediately allows the bar R to drop, thus seizing the threadsecurely between it and pulley P, stopping the pulley and preventingmore thread from paying out.

The continued movement of the bar H oscillates the arm I to the positionshown in full lines, Fig. 1, thus taking up the loop of thread below theWork, and pulling the under thread and the loop up into the Work as faras may be desired. This mechanism, being of metal and being connecteddirectly With or located adjacent to the heating-chamber L, is also keptWarm, and the thread is not allowed to cool or become hard.

What We claim is 1. In a sewing-machine, the combination, .With anintermittent thread-gripping device, of a take-up lever having tWooppositely-extending thread-carrying arms.

2. In a sewing-machine, the combination,

with the sliding bar H and its operating mechanism, of the three-armedtake-up lever pivotally connected with said bar to be operated thereby,the sheaves or rollers 2', carried by the two opposite arms of saidlever, and the guards N, overlapping said sheaves or rollers.

3. In a sewing-machine, the combination, With a take-up lever, of anintermittent thread-gripping device consisting of the pul ley P, thevertically-movable sliding bar R, having a projection, as pin 0, aspring, as S, for pressing said bar against said pulley, and thehorizontally-reciprocating sliding bar H, having an incline or shoulder,as d, to engage said pin or projection and lift the said bar R out ofcontact with the said pulley torelease the thread.

LEE E. MOORE. WILLARD A. DAVIS.

